I nearly bought a 2010 M6 vert. I didn't because the dealership wanted too much for it. Ordered a 550 instead.
It is a sensational vehicle. The exhaust note is money. The 2010 has a fairly new iDrive system. The SMG transmission is below average vs. the latest stuff but the rest of the vehicle was so much dynamite so it didn't matter. If you get a manual then no problem.
Current: 2015 i3 REx | Giga | Ionic Silver Metallic
2013 550i xDrive M Sport DHP | Jet Black | Venetian Beige | Dark Red Sycamore
2008 535xi Sport | Jet Black | Cream Beige | Burl Wood